HR: 16:45h
AN: PP12B-12
TI: Tropical Temperature Signals From Ice Sheet, Greenhouse Gas and Orbital Forcing
AU: * Broccoli, A J
EM: ajb@gfdl.noaa.gov
AF: NOAA/Geophysical Fluid Dynamics Laboratory, Princeton University, P.O. Box 308, Princeton, NJ 08542 United States
AU: Jackson, C S
EM: charles@ig.utexas.edu
AF: Institute for Geophysics The University of Texas, 4412 Spicewood Springs Road, Building 600 , Austin, TX 78759-8500 United States
AB: Simulations from an atmospheric general circulation model coupled to a simple mixed layer ocean are used to estimate the contributions from ice sheet, greenhouse gas, and orbital forcing to temporal variations in tropical temperature during the last glacial-interglacial cycle. Greenhouse gas forcing is estimated from a simulation in which the CO$_{2}$ level is altered. Ice sheet forcing is estimated from a simulation of the climate of the last glacial maximum. Orbital forcing is estimted from a series of simulations driven by orbital parameter changes. Model results are compared with proxy reconstructions of tropical temperature variations.
DE: 1620 Climate dynamics (3309)
DE: 3344 Paleoclimatology
DE: 4267 Paleoceanography
SC: PP
MN: 2001 AGU Fall Meeting